I am familiar with Lyle Mcdonald's "rapid fat loss diet" in which people basically consume mostly protein with little fat and carbs. Following the diet you can be eating well under 1,000 calories. Apparently this diet isn't too bad for you though because of the supplements you are taking and you are getting enough protein...obviously that isn't for the long term though. So for the short term, how low is too low? I am probably close to 100 pounds overweight right now, and I was thinking on going on a diet similar to the rapid fat loss diet. Basically I am going to eat enough protein, and not much carbs and fat (though more than you would eat actually doing RFL) and supplementing with 6 fish oil caps, 200 mg of magnesium, using lite salt on my food to get sodium and potassium, a multivitamin, and vit d. I will probably be eating somewhere between 1000-1400 cals a day even though my maintenance is probably around 3000. How healthy is this if I do it for a period of a few months (if I can handle it at least...obviously my will power isn't amazing or I wouldn't be so overweight). So how little is too little?